EST EST3X - Page 233

Chapter 7: Service and troubleshooting
EST3X Technical Reference Manual 223
Table 68: 3-AADC1 analog loop controller module troubleshooting
P
roblem Possible cause
An open
is detected on the
analog
loop
• The loop is incorrectly wired or a connector is loose
• A detector or isolator base is defective
• A conductor is broken
• A device is not installed on the loop
• A device is not entered into 3-SDU database
A short
is detected on the
analog
loop
• The loop is incorrectly wired
• A detector, detector base, or module is defective
• The insulation is nicked between conductors
A ground fault
is detected on
the
analog loop
• There is a pinched wire between a device and electrical box
• The wire insulation is nicked
Analog addressable detector
Table 69 provides a list of possible problems that may occur with an analog
addressable detector. For detailed information on identifying and locating faults,
refer to “Using the SDU Analog Addressable diagnostic tool” on page 226.
Table 69: Analog addressable detector troubleshooting
Symptom
Possible causes
The detector
is not responding
correctly
• The detector is installed in the wrong location or improperly
addressed
• The detector is not defined in the 3-SDU
• There is an incorrect device response in database
The detector display
s a trouble
on the LCD screen
• The detector is missing or incorrectly wired on the loop
• The detector information was not downloaded into 3-AADC1
module database (ID error)
• There is a ground fault on the loop
• There is an internal detector fault
The detector displays
incorrectly as
an alarm on the
LCD screen
• The detector is extremely dirty
•
If an ionization detector, it is installed in an area of extremely
high airflow
• The detector is installed in area of high ambient smoke
• The detector is defective